AD8206_05 AD | Alldatasheet
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Single-Supply, 42 V System Difference Amplifier AD8206 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Ideal for current shunt applications High common-mode voltage range −2 V to +65 V operating −5 V to +68 V survival Gain = 20 Wide operating temperature range Die: −40°C to +150°C 8-lead SOIC: −40°C to +125°C Adjustable offset Available in SOIC and die form EXCELLENT AC AND DC PERFORMANCE 15 μV/°C offset drift 30 ppm/°C gain drift 80 dB CMRR dc to 20 kHz
APPLICATIONS
High-side current sensing in Motor controls Transmission controls Diesel-injection controls Engine management Suspension controls Vehicle dynamic controls DC-to-dc converters FUNCTIONAL BLOCK DIAGRAM 04953-001 AD8206 +IN –IN NC NC = NO CONNECT GND OUT VREF1 VREF2 Figure 1. GENERAL DESCRIPTION The AD8206 is a single-supply difference amplifier for amplifying small differential voltages in the presence of large common-mode voltages. The operating input common-mode voltage range extends from −2 V to +65 V . The typical single- supply voltage is 5 V . The AD8206 is offered in die and packaged form. The operating temperature range for the die is 25°C higher (up to 150°C) than the packaged part to enable the user to apply the AD8206 in high temperature applications. Excellent DC performance over temperature keeps errors in the measurement loop to a minimum. Offset drift is typically less than 15 μV/°C, and gain drift is typically below 30 ppm/°C. The output offset can be adjusted from 0.08 V to 4.7 V with a 5 V supply by using the VREF1 and VREF2 pins. With VREF1 attached to the V+ pin, and VREF2 attached to the GND pin, the output is set at half scale. Attaching both pins to GND causes the output to be unipolar, starting near ground. Attaching both pins to V+ causes the output to be unipolar starting near V+. Other offsets can be obtained by applying an external voltage to the V REF1 and VREF2 pins.
Rev. 0 | Page 2 of 12 TABLE OF CONTENTS
REVISION HISTORY
7/05—Revision 0: Initial Version
Rev. 0 | Page 3 of 12 SPECIFICATIONS TA = operating temperature range, VS = 5 V , unless otherwise noted. Table 1. AD8206 SOIC AD8206 DIE Parameter Conditions Min Typ Max Min Typ Max Unit G A I N Initial 20 20 V/V Accuracy VO ≥ 0.1 V dc, 25°C ±1 ±1 % Accuracy Over Temperature Specified temperature range ±1.2 ±1.3 % Gain vs. Temperature 30 30 ppm/°C VOLTAGE OFFSET Offset Voltage (RTI) 25°C ±2 ±2.5 mV Over Temperature (RTI) Specified temperature range ±4.5 ±6 mV Offset Drift 15 15 μV/°C I N P U T Input Impedance Differential 400 400 kΩ Common Mode 200 200 kΩ Input Voltage Range Common mode, continuous −2 +65 −2 +65 V Differential1 250 250 mV Common-Mode Rejection 25°C, f = dc to 20 kHz2 76 86 76 86 dB Operating temperature range, f = dc to 20 kHz2 76 80 76 80 dB O U T P U T Output Voltage Range RL = 25 kΩ 0.08 4.7 0.08 4.7 V Output Resistance 200 200 Ω DYNAMIC RESPONSE Small Signal −3 dB Bandwidth 100 100 kHz Slew Rate 0.5 0.5 V/μs N O I S E
0.1 Hz to 10 Hz, RTI 20 20 μV p-p
Spectral Density, 1 kHz, RTI 0.5 0.5 μV/√Hz OFFSET ADJUSTMENT Ratiometric Accuracy3 Divider to supplies 0.497 0.503 0.497 0.503 V/V Accuracy, RTO Voltage applied to VREF1 and VREF2 in parallel ±2 ±2 mV/V Output Offset Adjustment Range VS = 5 V 0.08 4.7 0.08 4.7 V VREF Input Voltage Range 0.0 VS 0.0 VS V VREF Divider Resistor Values 24 32 40 24 32 40 kΩ POWER SUPPLY Operating Range 4.5 5.5 4.5 5.5 V Quiescent Current Over Temperature VO = 0.1 V dc 2 2 mA Power Supply Rejection Ratio 70 70 dB Temperature Range For Specified Performance Operating temperature range −40 +125 −40 +150 °C 1 Input voltage range = ±125 mV with half-scale offset. 2 Source imbalance <2 Ω. 3 The offset adjustment is ratiometric to the power supply when VREF1 and VREF2 are used as a divider between the supplies.
Rev. 0 | Page 4 of 12 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Supply Voltage 12.5 V Continuous Input Voltage −5 V to +68 V Reverse Supply Voltage 0.3 V Operating Temperature Range −40°C to +125°C Storage Temperature Range −65°C to +150°C Output Short-Circuit Duration Indefinite Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ESD CAUTION ESD (electrostatic discharge) sensitive device. Electros tatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge wi thout detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Figure 2. Metallization Diagram Figure 3. Pin Configuration Table 3. Pin Function Descriptions
2 GND −447 +34
3 VREF2 −432 −480
4 NC N/A N/A
5 OUT +444 −495
6 V+ +444 −227
7 VREF1 +456 +342
Die size is 1245 μm by 1400 μm. Passivation type is 8KA USG (Oxide) + 10KA Oxynitride. Bond pad metal composition is 98.5% Al, 1% Si, and 0.5% Cu.
The gain of the AD8206 is 20 V/V , with an accuracy of 1.2%. −40°C to +150°C with a guaranteed gain accuracy of 1.3%. operating temperature range. (VS = 5 V) for unidirectional and bidirectional operation. circuit (not shown), see Figure 16. created by a common-mode voltage is 0 V at the inputs of A1. resistance of RA, RB, and RC is approximately 200 kΩ ± 20%. reference voltage of 250 mV biases the attenuator above ground.
1 V/V from the reference pins to the output when the reference
the resistor ratio matching to better than 0.01%. a 300 μA current sink pull-down. Figure 16. Simplified Schematic
Figure 25. 8-Lead Standard Small Outline Package [SOIC] registered trademarks are the property of their respective owners.